Report wrapped pub exceptions with --verbose and --trace.

sdk/lib/_internal/pub/lib/src/command.dart

Index: sdk/lib/_internal/pub/lib/src/command.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command.dart b/sdk/lib/_internal/pub/lib/src/command.dart
index c6e25ead386e09395f4147ec529ea8ed8c3a1be0..221bc4536bb4696d639e2c823a730bf668e6b6dc 100644
--- a/sdk/lib/_internal/pub/lib/src/command.dart
+++ b/sdk/lib/_internal/pub/lib/src/command.dart
@@ -103,6 +103,12 @@ abstract class PubCommand {
         }
       }
 
+      if (error is ApplicationException && error.innerError != null) {
+        var message = "Wrapped exception: ${error.innerError}";
+        if (error.innerTrace != null) message = "$message\n${error.innerTrace}";
+        log.fine(message);
+      }
+
       if (options['trace']) {
         log.dumpTranscript();
       } else if (!isUserFacingException(error)) {